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(A-B) SEM images of paper adsorbed with AuNR-IgG conjugates. (C) Extinction spectra of AuNR-IgG conjugates in solution and on paper (inset: shows photographs of the bare filter paper (left) and filter paper after adsorption of AuNR+IgG conjugates (right)). (D) Six extinction spectra collected from different spots on a plasmonic paper of 0.5×0.5 cm2 area showing the remarkable spectral homogeneity of bioplasmonic paper.
